AP Biology aid » plant Biology » Plant structures » Macrostructures » understanding Xylem and also Phloem

Phloem consists of sieve tubes and companion cells, if xylem is composed of tracheids and vessel elements


Phloem can transport material bidirectionally, if xylem can only transport product unidirectionally


Explanation:

Xylem is dead in ~ maturity, if phloem is living. All various other answer selections are true. Xylem is likewise thicker and an ext rigid, which allows for greater pressure throughout water transport. It offers a strong support framework for the plant, allowing taller growth.

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Which that the adhering to are true regarding phloem?

I. It transports water from the roots to the leaves.

II. It transports sucrose native the pipeline to the roots.

III. It is located lateral come xylem in tree stems.


Explanation:

Phloem is located in the bark of trees and also transports street (such together sucrose) and organic compounds come the rest of the tree from the leaves. The various other plant vascular organization is xylem. Xylem is located outer hardwood of trees, and transports water native the root to the pipeline of trees.


Explanation:

Xylem transports water indigenous the root of a plant to the leaves. That does so with a passive process, negative water pressure created by transpiration in the leaves pulls water up from the roots with the xylem, comparable to the activity water relocating up a paper towel when one corner of a document towel is inserted in a pool of water. Xylem cells room dead at maturity so they can not perform photosynthesis. Sugars space transported by phloem (from the leaves to other locations of the plant). Stomata are structures the facilitate gas exchange.


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Example inquiry #4 : knowledge Xylem and also Phloem


Which that the following finest describes the primary role of xylem in plants?


Possible Answers:

Photosynthesis


Transport the water


Structural support of plants


Transport that nutrients


Correct answer:

Transport that water


Explanation:

Xylem is a type of tissue existing in vascular plants that is responsible because that water deliver within the organism. Types that cells contained within xylem incorporate tracheids, ship elements, parenchyma cells, and fibers.


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Example concern #5 : knowledge Xylem and Phloem


Xylem is responsible because that water carry within plants. Which that the complying with forces renders the upward activity of water with the xylem possible?


Possible Answers:

Root pressure


Transpirational pull


None of these


All of these


Correct answer:

All the these


Explanation:

The move of water v xylem in plants contains the upward motion of water. The forces of transpirational pull and also root push are responsible because that counteracting gravity and also producing water’s increase movement. Transpirational traction is defined as the surface ar tension resulted in by water evaporation that pulls water upward with xylem. Root pressure is defined by the distinction in water potential between the soil and plant, leading to water to travel into plant roots.


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Example question #6 : expertise Xylem and also Phloem


Which that the following is no true concerning tracheids?


Possible Answers:

They hold water versus gravitational force


They room a type of cabinet in xylem tissue


They have thick cell walls


They are square-shaped


Correct answer:

They space square-shaped


Explanation:

Tracheids room elongated cells the are contained within xylem tissue. Tracheids are responsible because that water and mineral transport. The thick cell wall surfaces of tracheids enable them to organize water versus gravitational pull as result of the adhesion building of water.


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Example concern #7 : understanding Xylem and Phloem


Which that the following is true concerning vessel elements in plants?


Possible Answers:

They are not discovered in gymnosperms


All of these


They have thick cell walls


They form tubular vessels


Correct answer:

All of these


Explanation:

Vessel facets are a cell type contained within xylem tissue of angiosperms. Vessel elements aid in the transport of water and minerals. Morphologically, vessel elements are defined as hole tubular cell that have actually thick cell walls and also are open up at both ends.


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Example concern #8 : knowledge Xylem and also Phloem


What is the primary function of phloem in plants?


Possible Answers:

Wound repair


Transport of necessary nutrients


Secretion of hormones


Photosynthesis


Correct answer:

Transport of necessary nutrients


Explanation:

Phloem is a type of organization in vascular plants that transports essential nutrients. Among other components, phloem consists of sieve elements, parenchyma cells, and supportive cells.


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Example concern #9 : expertise Xylem and Phloem


Which of the adhering to is an exact comparison between sieve pipe elements and also vessel elements?


Possible Answers:

Sieve tube aspects are living cell while vessel elements are technically dead


Vessel elements are life cells and also sieve tube aspects are technically dead


Sieve tube facets are in xylem tissue and also vessel facets are in phloem tissue


Vessel facets transport nutrient while sieve tube facets transports largely water


Correct answer:

Sieve tube elements are living cell while vessel elements are technically dead


Explanation:

Vessel facets are cells in phloem tissue that space technically dead. Upon maturation, the living material in the cell disappears when the cell wall remains; the cells are dead; however, sieve tube facets contain life tissue.

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Example question #10 : understanding Xylem and also Phloem


Which that the complying with are features of companion cell in vascular plants?


Possible Answers:

They have a huge number that ribosomes and also mitochondria


They have actually a big number that ribosomes and mitochondria and are a dedicated type of parenchyma cells


They perform not save on computer a nucleus


They execute not contain a nucleus and are a dedicated type of parenchyma cells


Correct answer:

They have a huge number that ribosomes and mitochondria and also are a devoted type of parenchyma cells


Explanation:

Companion cells space a form of committed parenchyma cells in vascular plants. They save on computer a huge number of ribosomes and mitochondria and also perform cellular features for sieve-tube elements, which castle are linked to by plasmodesmata.


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